fixes commit 274c5483 (main/cmake: fix circular dependency)

commit 116eb260 (main/brotli: upgrade to 1.1.0) introduced a
circular dependency:

  brotli -> cmake -> curl -> brotli

Solve this by use the embedded curl in cmake.

ccmake is 9MB so this makes it a chunk smaller for the common install,
and builds don't use it

closes #14716